一般过去时的规则和不规则变化(课堂PPT).ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,一般过去时的规则动词和不规则动词,旅10,1,规则动词,1.一般的动词：直接加-ed,如：watchwatched,helphelped,workworked,2.以字母e结尾的单词：加-d,如：loveloved livelived,arrivearrived,2,3.以辅音字母y结尾的动词：变y为i再加-ed,如：,study,studied,cry,cried,worry,worried,carry,carried,3,4.重读闭音节结尾的动词末尾只有一个辅音字母，需双写这个辅音再加-ed.,stop,_,stopped,shop,_,stopped,4,规则动词过去式记忆口诀,过去式构成有规律,一般词尾加-ed,如词尾有个e，直接加-d就可,辅音字母y结尾，变y为i加-ed,辅音重闭结尾，双写之后加-ed,5,不规则动词的过去式,（1）动词原形和过去式一样,letlet putput,readread cutcut,costcost hurthurt,6,（2）遇见i改为a,swim,sing,begin,sit,give,drink,swam,sang,began,sat,gave,drank,7,（3）过去式以ought和aught结尾的单词,bring,buy,think,catch,teach,brought,bought,thought,caught,taught,8,（4）中间去e末尾加t,feel,keep,sleep,felt,kept,slept,9,（5）把i变成o,riderode,（6）ow/aw变成ew,knowknew growgrew,（7）以d结尾的单词，把d改为t,buildbuilt sendsent,spendspent,10,